Brad Pitt had his iPhone in hand today as he took a private tour of the Documenta 13 art exhibition in Kassel, Germany. The Documenta event is held once every five years, and Brad, who is a well-known appreciator of art and architecture, stopped by to check out the newest installation during his stay in Europe. Earlier this week, Brad indulged in another one of his passions when he stopped by a Honda motorcycle shop in London. Angelina Jolie is currently filming Disney's Malificent there, and Brad and Angelina are staying in a $16 million home in the Richmond section of the city during their stay in England. Meanwhile, Brad will be completing some unexpected work of his own in the coming months. It was just announced that his zombie film, World War Z, is going through a rewrite that will require new footage to be filmed and potentially change the ending of the movie. Reshoots are expected to begin in September.